Downsides to using synchronize_rcu_expedited instead if synchronize_rcu in namespace_unlock

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Hi
I was wondering why namespace_unlock calls synchronize_rcu and not synchronize_rcu_expedited

Testing shows there is about 20-25 ms saved during an unmount when using synchronize_rcu_expedited

is there a downside to such a change?

Please let me know.
I would really appreciate any help understanding any pitfalls.

--
Thanks
Nikhilesh Reddy

Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.
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